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In the world of long range shooting 300yrds and such how much of a diff will 4'' of barrel make. Both barrels are 1-9 twist and its the same caliber 223......
I found this table online (another forum, and not very well formatted) and cleaned it up slightly.
NOTE: The original post had what was probably a misprint for the velocity of the 20" 55gr win FMJ. I adjusted that value to what I suspect is correct. It was originally 3529 and 3229 makes more sense.
So according to that you gain 75 fps or so going from 24" to 26" in .223 but it doesn't list 22" so interpolate.
There are plenty of cartridges that really benefit from longer barrels...typically small diameter heavy projectiles of whatever sort. Maybe not enough, but they do benefit.
Not much. 300 yards isn't much distance. From what I have read .223 remington has about 90fps change from a 22"-26" barrel. I ran a ballistics program with a few different .223 weight bullets with a difference in velocity of 90fps. At 300 yards the difference in windage holdover in a 10 mph 100% value wind was half an inch(14.6" of holdover for the slower and 14.0" for the faster). The difference in bullet drop at 300 yards from a 100 yard zero was about in inch (13.3 inches of drop from the faster, 14.4 from the slower). Thats just what the program I used said real quick.
I think the biggest differance you would notice is that longer barrels are easier to keep steady when shooting unsupported. Since they weigh more and have the weight farther forward, they tend to be a bit easier to keep steady. The differance in velocity probably won't be noticed much.
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